The physics journal Annalen der Physik publishes “On the Electrodynamics of Moving Bodies”, a paper submitted by a 26-year-old employee of the Swiss Patent Office, a recent physics graduate who has so far been unable to find a job in his field. In his paper, the author, Albert Einstein, outlines what will become known as the special theory of relativity.

Spain’s anarchist federation, the CNT, drops its long-standing opposition to taking government positions and agrees to enter the Catalan government, with three CNT leaders receiving positions. The left-socialist POUM also enters the government, receiving one position.